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Hurrah for free dynos...

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mr_pete
Trackday Trickster



Joined: 04 Apr 2006
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PostPosted: 16:52 - 03 Jun 2006    Post subject: Hurrah for free dynos... Reply with quote
I went to Coventry today, for a free dyno run. My little busa clocked 165.7 BHP and 197 MPH (with PCII and a K&N filter)

This upset a nice man with a NoS busa who, with £5K of engine work, only got 161 BHP and 193 MPH.

Techy graphs attached (the higher BHP reading came on the speed run)

Rar!
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TOM M
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PostPosted: 18:55 - 03 Jun 2006    Post subject: Reply with quote
Thats some power Thumbs Up
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G
The Voice of Reason



Joined: 02 Feb 2002
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PostPosted: 18:59 - 03 Jun 2006    Post subject: Re: Hurrah for free dynos... Reply with quote
mr_pete wrote:

This upset a nice man with a NoS busa who, with £5K of engine work, only got 161 BHP and 193 MPH.

Did he actually use the Nitrous Confused.

Sounds very good for a stock one.

Sadly, despite the blurb suggesting there was a free dyno at the ocford and Conventry stores, it was only at the Coventry store.
Luckily I called up before so didn't waste my time.
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Kickstart
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PostPosted: 19:52 - 03 Jun 2006    Post subject: Reply with quote
Hi

Wandered along, but got there fairly late (3:30 ish). Couldn't see the dyno anywhere.

All the best

Keith
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mr_pete
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PostPosted: 19:53 - 03 Jun 2006    Post subject: Re: Hurrah for free dynos... Reply with quote
G wrote:
Did he actually use the Nitrous Confused.


Nope, you're not allowed to run Nitrous on a dyno - apparently it buggers up their rolling road! (too fast!)

Either way, unless the Nitrous ports into his cylinders had shagged his engine, it's still a reasonable run @ 193mph. He did say he'd had it mapped with the TRE on, and subsequently removed it, so it's not going to be chucking out what it could have - and the stock ECU run put out the precise 155BHP they should out of the box (although I believe he had a decent air filter, and a 4>2>1 exhaust conversion - so should have got more!)

Ah well Smile
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Last edited by mr_pete on 20:00 - 03 Jun 2006; edited 1 time in total
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mr_pete
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Joined: 04 Apr 2006
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PostPosted: 19:53 - 03 Jun 2006    Post subject: Reply with quote
Kickstart wrote:

Wandered along, but got there fairly late (3:30 ish). Couldn't see the dyno anywhere.


I left at 3:15pm, and the last run was at 3:05pm - sorry!
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Kickstart
The Oracle



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PostPosted: 20:00 - 03 Jun 2006    Post subject: Re: Hurrah for free dynos... Reply with quote
mr_pete wrote:
it's still a reasonable run @ 193mph.


The speed is pretty much just down to the gearing. Get the gearing right and a 125 would spin a dyno up to that (although if it had H rated tyres I don't think I would want to be near it).

All the best

Keith
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Cog Head
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Joined: 21 Oct 2005
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PostPosted: 20:02 - 03 Jun 2006    Post subject: Reply with quote
wow, my m8's dads ZX-12R made 175.2 BHP, which is with a yohis full exhaust system and stage 2 (or 3 i cant remember) dyno tuning, it sounds like sex on wheels, fookn flys too Exclamation
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NSR Mick
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PostPosted: 20:10 - 03 Jun 2006    Post subject: Reply with quote
Remember that dynos can be adjusted to boost owners ego's. Thumbs Up
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Simple
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PostPosted: 22:21 - 03 Jun 2006    Post subject: Reply with quote
gsxrmick wrote:
Remember that dynos can be adjusted to boost owners ego's. Thumbs Up


Yes but this one wasn't

Geeperz managed 31.1bhp

Whistle

Phoenix and Mr pete made me dyno poor Geeperz.

Simple
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Lawnie
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PostPosted: 22:27 - 03 Jun 2006    Post subject: Reply with quote
How much does a dyno run cost normally?
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Simple
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PostPosted: 22:32 - 03 Jun 2006    Post subject: Reply with quote
Rob84 wrote:
How much does a dyno run cost normally?


not sure,
but you'd get more out of a paid one than just power,
I wanted to find out the torque but they weren't doing that.

(Phoenix recons about £25)

Simple
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G
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PostPosted: 22:40 - 03 Jun 2006    Post subject: Reply with quote
I've usually seen about £20 for a single run, relatively less if you want a few runs along with some playing.

You should get power, torque and air/fuel mixture for a paid one.

You can always work out torque manually simple - google for the calculation, but something around power=torque*rpm*5220 .
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Simple
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PostPosted: 22:41 - 03 Jun 2006    Post subject: Reply with quote
I don't know the RPM though
the dyno print outs are only mph vs bhp
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G
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PostPosted: 22:42 - 03 Jun 2006    Post subject: Reply with quote
Ah, you could always work out what rpm=what mph Smile.
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Simple
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PostPosted: 22:44 - 03 Jun 2006    Post subject: Reply with quote
G wrote:
Ah, you could always work out what rpm=what mph Smile.


how? Top speed on the dyno was 126mph, I've only had 108mph
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mr_pete
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PostPosted: 22:50 - 03 Jun 2006    Post subject: Reply with quote
Simple wrote:

Phoenix and Mr pete made me dyno poor Geeperz.


Oi! I seem to recall that Madam said "Hmm, shall I do it, I'm quite interested now"....

When precisely did we stick your arm behind your back? Razz
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mr_pete
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PostPosted: 22:51 - 03 Jun 2006    Post subject: Reply with quote
Simple wrote:
Top speed on the dyno was 126mph, I've only had 108mph


Wind resistance, as my friend Ian pointed out, won't be affecting the dyno, but will affect you riding - and will happily crimp several mph off your top end...
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Simple
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PostPosted: 23:03 - 03 Jun 2006    Post subject: Reply with quote
Yeh I know resistence from wind road rider weight etc will reduce my top speed, which is why I can't work out the torque from the RPM on the road...

and no you didn't force me to do it

but Alex saying, lets see if it is 33bhp and you going yeah go on for a laugh you're not completely innocent Razz
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Phil_G
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PostPosted: 23:04 - 03 Jun 2006    Post subject: Reply with quote
Simple wrote:
G wrote:
Ah, you could always work out what rpm=what mph Smile.


how? Top speed on the dyno was 126mph, I've only had 108mph


theoretical speeds can be worked out using the rpms against the bikes gear ratio and final drive (or something like that)

not 100% certain of the exact method
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proximity
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PostPosted: 23:13 - 03 Jun 2006    Post subject: Reply with quote
I would expect the wind to knock a lot more than 18 mph off the top speed.
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Simple
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PostPosted: 23:15 - 03 Jun 2006    Post subject: Reply with quote
Phil_G wrote:
Simple wrote:


how? Top speed on the dyno was 126mph, I've only had 108mph


theoretical speeds can be worked out using the rpms against the bikes gear ratio and final drive (or something like that)

not 100% certain of the exact method


too many uncertainties to calculate ethe torque, don't know how far out m bike's speedo is or the dyno was etc...

meh It'll be one of those unknown things Confused
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Phil_G
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PostPosted: 23:36 - 03 Jun 2006    Post subject: Reply with quote
Simple wrote:


too many uncertainties to calculate ethe torque, don't know how far out m bike's speedo is or the dyno was etc...

meh It'll be one of those unknown things Confused


Agreed, But that post I made was in response to a post asking about calculating engine rpm from the information to hand I.e the speed
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mr_pete
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PostPosted: 23:40 - 03 Jun 2006    Post subject: Reply with quote
Simple wrote:
and you going yeah go on for a laugh you're not completely innocent Razz


In so many ways.... Razz

But, you did nearly hit 33bhp, so it was a good test of the bike and it's limits - if you hit more you could have grinned: )
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mr_pete
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PostPosted: 23:41 - 03 Jun 2006    Post subject: Reply with quote
proximity wrote:
I would expect the wind to knock a lot more than 18 mph off the top speed.


She's not big enough to gain that much wind resistance if she sits up Smile
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